Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 493 · 40 questions

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

1. 1.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 3 years?
2. 2.495 + 594 =
3. 3.Take 25 and take away the sum of its digits. What do you get?
4. 4.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
5. 5.12 × 8 + 2 =
6. 6.Take 28 and take away the sum of its digits. What do you get?
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
8. 8.Double 21 =
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
10. 10.98 × 100 =
11. 11.865 × 10 =
12. 12.1 + 2 + 3 + … + 67 =
13. 13.The 8th of a month is a Saturday. What day is the 16th of the same month? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
14. 14.Half of 72 =
15. 15.8 × 9 =
16. 16.Magic square (every row, column and diagonal has the same total): 8 6 16 | 18 ? 2 | 4 14 12. What is the missing number?
17. 17.A father is 44 years old and his son is 8. How old was the father when the son was born?
18. 18.1 + 2 + 3 + … + 18 =
19. 19.17 × 100 =
20. 20.A piggy bank has 5 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
21. 21.111 × 111 =
22. 22.274 × ? = 2740
23. 23.51 × 4 =
24. 24.Magic square (every row, column and diagonal has the same total): 24 10 20 | 14 18 ? | 16 26 12. What is the missing number?
25. 25.Magic square (every row, column and diagonal has the same total): 18 8 10 | 4 12 ? | 14 16 6. What is the missing number?
26. 26.If today is Tuesday, what day was it 17 days ago? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
27. 27.Take 84 and take away the sum of its digits. What do you get?
28. 28.Magic square (every row, column and diagonal has the same total): 22 ? 28 | 25 19 13 | 10 31 16. What is the missing number?
29. 29.I thought of a number, added 5 and then doubled it. I got 46. What was my number?
30. 30.9 × 10 = ?0 — what is the missing digit?
31. 31.12345678 × 9 + 9 =
32. 32.Take 40 and take away the sum of its digits. What do you get?
33. 33.11 × ? = 11000
34. 34.Magic square (every row, column and diagonal has the same total): ? 6 16 | 10 14 18 | 12 22 8. What is the missing number?
35. 35.39 × ? = 390
36. 36.12345679 × 63 =
37. 37.9 × 6 =
38. 38.The ages of two twins add up to 28. How old is each twin?
39. 39.9 × 5 = 4? — what is the missing digit?
40. 40.Magic square (every row, column and diagonal has the same total): 10 ? 6 | 3 7 11 | 8 9 4. What is the missing number?

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